IADC
|
WOB
|
RPM
|
Application
|
(KN/mm)
|
(r/min)
|
111/114/115
|
0.3-0.75
|
200-80
|
very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk
|
116/117
|
0.35-0.8
|
150-80
|
very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk
|
121
|
0.3-0.85
|
200-80
|
soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone
|
124/125
|
|
180-60
|
131
|
0.3-0.95
|
180-80
|
soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds
|
136/137
|
0.35-1.0
|
120-60
|
211/241
|
0.3-0.95
|
180-80
|
medium formations with high compressive strength, like medium, soft shake, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbeds.
|
216/217
|
0.4-1.0
|
100-60
|
246/247
|
0.4-1.0
|
80-50
|
medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite
|
321
|
0.4-1.0
|
150-70
|
medium abrasive formations, like abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble
|
324
|
0.4-1.0
|
120-50
|
437/447/435
|
0.35-0.9
|
240-70
|
very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk, gypsum, salt, soft limestone
|
517/527/515
|
0.35-1.0
|
220-60
|
soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone
|
537/547/535
|
0.45-1.0
|
220-50
|
soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds
|
617/615
|
0.45-1.1
|
200-50
|
medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite
|
637/635
|
0.5-1.1
|
180-40
|
hard formation with high compressive strength, like limestone, sandstone, dolomite, hard gypsum, marble
|
Note: Above limits of WOB and RRPM should not be used simultaneously
|